D defs.my
Entry 1 sense Webster, 1913

Water sail

/wôt'-ẽr sāl/ · Wa·ter sail · IPA
01 A small sail sometimes set under a studding sail or under a driver boom, and reaching nearly to the water.
  1. 1.
    A small sail sometimes set under a studding sail or under a driver boom, and reaching nearly to the water.(Naut.)